What was the first cell viewed by the light microscope

The image shows ekgs of a person with normal heart waves and of a person having tachycardia. based on this image, what kind of condition is tachycardia? a. the heart beats abnormally fast. b. the heart beats abnormally slow. c. the right atrium of the heart stops working. d. the left ventricle pumps less blood to the aorta.

Models are non-visual ways of coummincating how someone thinks about something in the natural world

Acommon kind of mechanical weathering is called